<template>
<div id="root">
		<div class="todo-container">
			<div class="todo-wrap">
				<!-- <MyHeader :addTodo="addTodo"/> -->
				<!-- 自定义事件 -->
				<MyHeader @addTodo="addTodo"/>
				<MyList :todos="todos"/>
				<MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
		</div>
	</div>
  </div>
</template>

<script>
import MyHeader from './components/MyHeader.vue'
import MyList from './components/MyList.vue'
import MyFooter from './components/MyFooter.vue'

export default {
  name: 'App',
  components: {
    MyHeader,MyList,MyFooter
  },
  data(){
	return{
		// todos:[]
		todos:JSON.parse(localStorage.getItem('todos')) || []
	}
  },
  methods:{
	// 添加一个todo
	addTodo(todoObj){
		this.todos.unshift(todoObj)
	},
	// 取消勾选
	checkTodo(id){
		this.todos.forEach((todo)=>{
			if(todo.id==id) todo.done=!todo.done
		})
	},
	deleteTodo(id){
		this.todos=this.todos.filter(todo=>todo.id !==id)
	},
	// 全选或取消全选
	checkAllTodo(done){
		this.todos.forEach((todo)=>{todo.done=done})
	},
	//清除
	clearAllTodo(){
		this.todos=this.todos.filter(todo=>!todo.done)
	}
  },
  watch:{
	todos:{
		deep:true,
		handler(value){
			localStorage.setItem('todos',JSON.stringify(value))
		}
	}
  },
  mounted(){
	this.$bus.$on('checkTodo',this.checkTodo)
	this.$bus.$on('deleteTodo',this.deleteTodo)
  },
  beforeDestory(){
	this.$bus.$off('checkTodo')
	this.$bus.$off('deleteTodo')
  }
}
</script>

<style>
/*base*/
	body {
		background: #fff;
	}
	.btn {
		display: inline-block;
		padding: 4px 12px;
		margin-bottom: 0;
		font-size: 14px;
		line-height: 20px;
		text-align: center;
		vertical-align: middle;
		cursor: pointer;
		box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
		border-radius: 4px;
	}
	.btn-danger {
		color: #fff;
		background-color: #da4f49;
		border: 1px solid #bd362f;
	}
	.btn-edit {
		color: #fff;
		background-color: blue;
		border: 1px solid #bd362f;
	}
	.btn-danger:hover {
		color: #fff;
		background-color: #bd362f;
	}
	.btn:focus {
		outline: none;
	}
	.todo-container {
		width: 600px;
		margin: 0 auto;
	}
	.todo-container .todo-wrap {
		padding: 10px;
		border: 1px solid #ddd;
		border-radius: 5px;
	}
</style>
